Mechanical analysis of the effects of implant position and abutment height on implant-assisted removable partial dentures

Ohyama, Tetsuo; Nakabayashi, Shinya; Yasuda, Hiroyasu; Kase, Takeshi; Namaki, Shunsuke

doi:10.1016/j.jpor.2019.09.007

Cited by 15 publications

(50 citation statements)

References 22 publications

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“…The results were extracted and grouped to identify the targeted problem and how to solve it. Among the selected articles, 14 studies have reported the influence of different retainer designs [44,[55][56][57][58][59][60][61][62][63][64][65][66][67], while seven studies measured the influence of different designs and materials of major connectors [66,[69][70][71][72][73][74], and the studies concerned with implant-assisted RPD were ten articles [17,43,55,[76][77][78][79][80][81][82]. The results were broad-covering with heterogeneous and disparate data, which made it not compatible to be a meta-analysis or systematic review.…”

Section: Resultsmentioning

confidence: 99%

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Biomechanics in Removable Partial Dentures: A Literature Review of FEA-Based Studies

Mousa

Abdullah

Jamayet

et al. 2021

BioMed Research International

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The present study was aimed at reviewing the studies that used finite element analysis (FEA) to estimate the biomechanical stress arising in removable partial dentures (RPDs) and how to optimize it. A literature survey was conducted for the English full-text articles, which used only FEA to estimate the stress developed in RPDs from Jan 2000 to May 2021. In RPDs, the retaining and supporting structures are subjected to dynamic loads during insertion and removal of the prosthesis as well as during function. The majority of stresses in free-end saddle (FES) RPDs are concentrated in the shoulder of the clasp, the horizontal curvature of the gingival approaching clasp, and the part of the major connector next to terminal abutments. Clasps fabricated from flexible materials were beneficial to eliminate the stress in the abutment, while rigid materials were preferred for major connectors to eliminate the displacement of the prosthesis. In implant-assisted RPD, the implant receive the majority of the load, thereby reducing the stress on the abutment and reducing the displacement of the prosthesis. The amount of stress in the implant decreases with zero or minimal angulation, using long and wide implants, and when the implants are placed in the first molar area.

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Section: Resultsmentioning

confidence: 99%

“…BioMed Research International reported at the mesial side of the residual ridge. Placement of the implant in the first molar area has been proven to have the lowest stress in the implant, lowest stress in abutment teeth, and lowest stress in the distal side of the residual ridge [17,55,[76][77][78][79].…”

mentioning

confidence: 99%

Biomechanics in Removable Partial Dentures: A Literature Review of FEA-Based Studies

Mousa

Abdullah

Jamayet

et al. 2021

BioMed Research International

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“…Their loading was uniformly distributed, and this was supposed to suppress the displacement of IARPD. Ohyama et al used three-dimensional FEM to assess implant position and optimal implant height [ 36 ]. They suggested that higher (2 mm height) abutment could suppress the displacement of ISRPD, and the effectiveness of the distal implant was reported.…”

Section: Discussionmentioning

confidence: 99%

“…The limitations associated with in vitro study, such as loading condition and mandibular acrylic resin model, must be described. Regarding the loading condition, the previous studies analyzed biomechanical behavior using one-point loading [ 9 , 12 , 15 , 21 , 26 ], uniform distributed loading [ 33 , 35 ] or other conditions [ 13 , 14 , 36 ]. During mastication, the distribution of occlusal force is continuously changing, and one-point loading can simulate the beginning of the mastication [ 13 ].…”

Section: Discussionmentioning

confidence: 99%

In Vitro Assessment of the Effect of Implant Position on Biomechanical Behaviors of Implant-Supported Removable Partial Dentures in Kennedy Class II Condition

et al. 2021

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The purpose of this study was to investigate the effects of implant position and loading position on biomechanical behaviors using implant-supported removable partial denture (ISRPD) models in a simulated Kennedy class Ⅱ partially edentulous mandible. Three types of Kennedy class Ⅱ mandibular acrylic resin models (a conventional RPD without support by an implant—CRPD; models with an implant placed at first molar (#46)—MP-ISRPD— and second molar (#47)—DP-ISRPD) were used to measure vertical displacement of the RPD, mesio-distal displacement of the abutment tooth, and bending moment of the abutment tooth and implant under one-point loading. The variables at three respective loading points (#45, #46 and #47) were compared statistically. Vertical displacement was suppressed in ISRPDs compared to the CRPD, and significant effects were identified under loading at the implant position. The largest meiso-distal displacement was observed in MP-ISRPD under #47 loading. Bending moments of the abutment tooth and implant were significantly higher in MP-ISRPD than in DP-ISPRD. In MP-ISRPD, a higher bending moment of the abutment tooth under #45 and #47 loading was detected, although the bending moment in DP-ISRPD was almost zero. The results of this study suggested that MP-ISRPD shows the specific biomechanical behaviors, although DP-ISRPD might provide biomechanical benefits under all one-point loading conditions.

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“…This method uses contour diagrams to illustrate quantitatively the distribution of stress applied to an object, thereby clarifying its mechanical characteristics. In cases of prosthetic treatment with an implant-assisted removable partial denture for a missing mandibular unilateral distal extension, the mechanical effects of implant position and implant abutment height on the abutment tooth, denture, and tissue supporting the denture were evaluated with three-dimensional finite element analysis [22]. Because the present study used a three-dimensional model to examine mandible deflection and torsion, three-dimensional finite element analysis was selected.…”

Section: Discussionmentioning

confidence: 99%

Mechanical effects of residual bone mass, a maxillofacial prosthesis, and a reconstruction plate on the mandible after marginal resection

et al. 2020

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In this study, analytic models were used to simulate marginal resection in the area of the second premolar to the second molar region, and the mechanical effects on the mandible of residual bone mass, a maxillofacial prosthesis, and a reconstruction plate were evaluated by three-dimensional finite element analysis. As residual bone mass decreased, maximum principal stress increased near the anterior ramus of the mandible, and maximum shear stress increased at the anterior buccal region of the resected area. In the mandible with a maxillofacial prosthesis, the maximum principal stress distribution at the anterior ramus was lower, and the distribution of maximum shear stress at the anterior buccal region of the resected area was higher. When a reconstruction plate was used, maximum principal stress and maximum shear stress were lower. Thus, lower residual bone mass was associated with increased mandible deflection and torsion. In addition, presence of a maxillofacial prosthesis decreased deflection but increased torsion, and presence of a reconstruction plate decreased deflection and greatly decreased torsion. These findings suggest that decreased residual bone mass and maxillofacial prostheses increase fracture risk; however, presence of a reconstruction plate was effective in decreasing torsional stress, thereby reducing fracture risk in the mandible.

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Mechanical analysis of the effects of implant position and abutment height on implant-assisted removable partial dentures

Cited by 15 publications

References 22 publications

Biomechanics in Removable Partial Dentures: A Literature Review of FEA-Based Studies

Biomechanics in Removable Partial Dentures: A Literature Review of FEA-Based Studies

In Vitro Assessment of the Effect of Implant Position on Biomechanical Behaviors of Implant-Supported Removable Partial Dentures in Kennedy Class II Condition

Mechanical effects of residual bone mass, a maxillofacial prosthesis, and a reconstruction plate on the mandible after marginal resection

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